Answer:
- The second choice: <u><em>22 g He </em></u><em>will have the greatest volume at STP</em>
Explanation:
Following Avogadro's principle, under ideal condtions, the <em>volume</em> of the gases at the same conditions of temperature, and pressure, is proportional to the number of molecules.
Then, you can calculate the number of molecules for each of the gases to determine which is the sample with the greatest number of molecules and, hence, which will have the greatest volume at STP (standard temperature and pressure).
The formula to calcualte the number of molecules (in moles) is:
- n = mass in grams / molar mass
Then, since the mass is the same (22 g) for the four options, the result will be dependent on the molar mass: the gass witht the smallest molar mass will give the largest number of moles for 22 g, and will have the greatest volume.
<u><em>a) 22 g CO:</em></u>
- Molar mass of CO ≈ 28 g/mol
<u><em>b) 22 g He:</em></u>
- Molar mass of He ≈ 4.0 g/mol
<em><u>c) 22 g O₂ </u></em>
- Molar mass of O₂ ≈ 32 g/mol
<em><u>d) 22 g Cl₂</u></em>
- Molar mass of Cl₂ ≈ 71 g/mol
<u>Conclusion</u>: since He has the smallest molar mass, the sample of 22 g of He gas will have the greatest volume at STP.
Answer : The balanced reaction in acidic solution is,
Explanation :
The given partial equation is,
First we have to separate into half reaction. The two half reactions are:
Now we have to balance the half reactions in acidic medium, we get:
............(1)
............(2)
Now we have to balance the electrons of the half reactions. When we are multiplying the equation (1) by 2, we get
...........(3)
Now we have to add both the half reactions (2) and (3), we get the final balanced chemical reaction.
Answer:
Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances.
Explanation:
Answer:
4 L or 4000 mL
Explanation:
This question asks for the use of combined gas law:
(P1)(V1) / (T1) = (P2)(V2) / (T2)
...where pressure (P) is in atm, volume (V) is in liters, and temperature (T) is in kelvin.
1000 ml is 1 L, and everything else is already in the right units.
(1 atm)(1 L) / (20 K) = (0.5 atm)(V2) / (40 K)
Just solve the equation for V2, and you get a new volume of 4 liters
(1)(1) / (20) = (.5x) / (40)
1 / 20 = .5x / 40
2 = .5x
x = 4
The mass of the cube with length of 2cm is
- We were given length of cube as
<em>To know the volume of cube we can use the expression</em>
<em />
Volume of cube =
Where a= length of cube=
Then volume of the cube
- Density was given as
But we know that density is the ratio of mass to the volume of a substance.
- Then
But we are looking for mass of the object, the we can make Mass as subject of the formula
Them substitute the values
<em>Therefore mass of the cube is</em>
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